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Finding the Fourth Proportional to 256.72, 354.20 and 158.32

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Solution

The fourth proportional to 256.72, 354.20 and 158.32 is: 218.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.72 : 354.20 = 158.32 : x
  2. Step 2: Convert to fraction form
    256.72/354.20 = 158.32/x
  3. Step 3: Cross multiply
    256.72x = 354.20 × 158.32
  4. Step 4: Simplify right side
    256.72x = 56,076.94
  5. Step 5: Solve for x
    x = 56,076.94/256.72
  6. Step 6: Final answer
    x = 218.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.